摘要
液室压力和压边力加载路径是充液拉深工艺中决定零件成形质量的关键工艺参数。针对传统被动加压方式加载路径单一,液室压力较低,不能满足复杂结构零件和高强度材料的成形要求,提出采用闭环控制技术实时调节液室压力和压边力的动态加载方式。设计可控压边和高压增压系统,并应用基于上、下位机的检测控制系统实时调节凸模速度、压边力和液室压力满足设定的工艺参数。在动态加载系统上进行异型结构不锈钢零件的充液拉深试验,动态加载路径下试验件一次整体成形,且表面质量好,贴模精度高。结果表明,充液拉深动态加载系统能够实现复杂加载轨迹和局部高压,适用于复杂结构和高强度材料零件的成形制造。
The loading paths of cavity pressure and blank holding force（BHF） are the key parameters immediately related with the forming quality in hydrodynamic deep drawing process. Aiming at the issues of single loading trajectory and low liquid pressure in the passive-pressurization model, which can not satisfy the need of the complex structural components and high strength materials, a dynamic loading method employing closed-loop control technique to realize the real time adjustment of cavity pressure and BHF is presented. The controllable blank holding system and high pressure ＆ pressurization device are designed, and the control system based on upper and lower computers is applied to regulate punch velocity, BHF and cavity pressure, which can change in real time according to assigned craft curves. The process experiments conducted on the dynamic loading system implement the integral and precision forming of a typical stainless steel part with complex features, and the test parts under dynamic loading paths have good surface quality and high forming precision. The results indicate that the dynamic loading technology can implement complicated loading paths and partial high pressure, which are propitious to form complicated structural components and high-strength materials.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2013年第24期60-66,共7页
Journal of Mechanical Engineering
关键词
板材
充液拉深
液室压力
动态加载
闭环控制
Sheet metal Hydrodynamic deep drawing Cavity pressure Dynamic loading Closed-loop control
